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Backdoor.ASP.WEBSHELL.KEPL

June 21, 2019
 PLATFORM:

Windows, Linux, MacOS

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware

This Backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites. It may be hosted on a website and run when a user accesses the said website.

It executes commands from a remote malicious user, effectively compromising the affected system.

  TECHNICAL DETAILS

File Size:

138,306 bytes

File Type:

ASP

Memory Resident:

No

Initial Samples Received Date:

20 Jun 2019

Payload:

Downloads files, Deletes files, Creates files, Displays windows

Arrival Details

This Backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It may be hosted on a website and run when a user accesses the said website.

Backdoor Routine

This Backdoor executes the following commands from a remote malicious user:

  • Lists directories and files (includes file information)
  • Adds and removes mapped drives
  • Creates files and folders
  • Renames files and folders
  • Copies, moves, and deletes files
  • Runs SQL command
  • Executes arbitrary commands via CMD
  • Uploads and downloads files
  • Remotely views image files (JPEG, GIF, BMP, PNG)

Other Details

This Backdoor does the following:

  • When hosted on a web server, it is able to display the following windows, where the attacker can perform the backdoor activity:

    • Directory Explorer




    • SQL Window




    • CMD Window

It does not exploit any vulnerability.

It requires being hosted on a web server in order to proceed with its intended routine.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

15.186.03

FIRST VSAPI PATTERN DATE:

20 Jun 2019

VSAPI OPR PATTERN File:

15.187.00

VSAPI OPR PATTERN Date:

21 Jun 2019

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 2

Scan your computer with your Trend Micro product to delete files detected as Backdoor.ASP.WEBSHELL.KEPL. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check the following Trend Micro Support pages for more information:


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